Free Expert Guides on Power Systems, Circuit Design & Electrical Troubleshooting

The tuning method is suitable for measuring the ground parameters of systems where the neutral point is grounded via an arc suppression coil, but not applicable to ungrounded neutral point systems. Its measurement principle involves injecting a current signal with continuously varying frequency from the secondary side of the Potential Transformer (PT), measuring the returned voltage signal, and identifying the system's resonant frequency.During the frequency sweeping process, each injected heter

DefinitionAn electrical grid, also known as a power grid, is defined as a comprehensive network that integrates power generation, transmission, and distribution units. Its primary function is to facilitate the transfer of electrical power from power generation sources to end - users. A substantial amount of electricity is transmitted from power generation stations to load centers at voltages of 220kV or even higher. The network composed of these high - voltage transmission lines is referred to a

A substation supplies energy to the local area where the power lines are located. Its primary function is to gather the high - voltage energy transmitted from the generating station and then step down the voltage to a suitable level for local distribution. Additionally, it provides facilities for switching operations.There are two main types of substations. One is the simple switching - type substation, which is responsible for establishing different connections between transmission lines. The o

A three - phase system features three live conductors, supplying 440V power to large consumers. In contrast, a single - phase system has only one live conductor and is mainly used for domestic applications. Here are the key advantages of a three - phase system over a single - phase system:Higher RatingThe rating, or output, of a three - phase machine is approximately 1.5 times that of a single - phase machine of the same size.Constant PowerIn single - phase circuits, the power delivered is pulsa

Factors Determining When to Start Grid Peaking UnitsThe timing for starting grid peaking units is primarily determined by multiple factors to ensure the stable operation and efficient use of resources in the power system. Below are the main factors that influence when to start peaking units:1. Load Demand Variations Peak Load Periods: During times when grid load reaches or approaches its peak (such as during working hours or summer air conditioning usage peaks), additional generation capacity is

Calculating the fault current (short-circuit current) on the secondary side of a transformer supplying a transmission line is a complex process that involves multiple parameters of the power system. Below are the steps and relevant formulas to help you understand how to perform this calculation. We will assume the system is a three-phase AC system, and the fault occurs on the transformer's secondary side.1. Determine System ParametersTransformer Parameters: Rated capacity of the transformer rate

Advantages and Disadvantages of a Ring Main Electrical SystemA ring main electrical system is a common topology for distribution networks, especially in medium-voltage and low-voltage power distribution systems. It connects multiple loads or distribution points in a closed loop to distribute electricity. Below are the advantages and disadvantages of a ring main electrical system:I. AdvantagesHigh Reliability Redundant Power Supply: A ring system has two paths for power supply. Even if one sectio

Types of Faults in Power Grid SystemsPower grid system failure refers to various abnormal conditions that occur in the power system. These faults may affect the normal operation of the power system, leading to equipment damage, power outages, and other issues. The following are several common types of faults in power grids:1. Short circuit faultShort circuit fault refers to the phenomenon in which the impedance between conductors of different phases in a power system, or between a conductor and

Determining the input/output impedance of circuits with transistors or other active components is an important step to understand the performance and matching characteristics of the circuit. Here are some common methods and techniques for determining these impedances:1. Analytical MethodsInput ImpedanceSmall-Signal Model: Use the small-signal model of the transistor (such as common-emitter, common-base, common-collector, etc.) to analyze the input impedance.Common-Emitter Amplifier: The input im

Advantages and Disadvantages of Measuring the Resistance of a Given Coil with a Wheatstone Bridge1. Advantages(I) High precision and accuracyThe Wheatstone bridge is based on the principle of proportional measurement, measuring by comparing known and unknown resistances (in this case, the unknown resistance is the resistance of the given coil). This method of measurement is highly sensitive to changes in resistance values and can achieve a high degree of measurement accuracy. For example, under